Copper cover aluminum alloy compound wire and production technology thereof
Technical field
The invention belongs to laminate metal material Technology of Plastic Processing field, be specifically related to a kind of copper cover aluminum alloy compound wire and production technology thereof.
Background technology
The bimetallic copper-clad aluminum conductor is at the concentric coated copper layer of aluminum core line outer surface, make two kinds of metals form a bulk metal wire rod in the interatomic metallurgical binding of interface formation, the production technology that copper-clad aluminum conductor is commonly used is: almag through melting, continuous casting bar, draw circle, cleaning, coated copper layer, then through rough, draw greatly, intermediate annealing, in draw, intermediate annealing, carefully draw, anneal, get finished product.Copper-clad aluminum conductor has both simultaneously the advantage of copper and two kinds of metals of aluminium, and has reduced the cable production cost under the prerequisite that guarantees signal transmission quality.CCAM is the high-strength products of new generation of releasing on the basis of copper-clad aluminum conductor, is as heart yearn, the concentric coated copper layer of appearance with almag; Electric, the mechanical property of CCAM combines that copper good electric conductivity and aluminum-magnesium alloy wire are lightweight, the advantage of advantages of good shielding performance between copper cash and aluminum-magnesium alloy wire.Compare with copper cash: the proportion of CCAM and pure copper wire is than being 1:2.5, therefore have lightweight, cost-effective huge advantage; Compare with aluminum-magnesium alloy wire, CCAM since the concentric coating in its heart yearn surface one deck fine copper, therefore have with the same solderability of pure copper wire, and needn't as aluminum-magnesium alloy wire, do special processing.Compare with copper-clad aluminum conductor, the series of advantages such as have more light specific gravity, damping and amortization is good, thermal conductivity is good, the electromagnetic shielding ability is strong and vibration damping is good has especially strengthened tensile strength and elongation, and the mechanicalness of this product and applicability are increased dramatically.Yet, no matter be copper cladding aluminum conductor, copper clad aluminum magnesium alloy wire or aluminum-magnesium alloy conductor containing rare earth covering by cuprum, the raising of its intensity realizes by improving the core Magnesium in Aluminium Alloy and increasing cold-drawing deformation, therefore will inevitably cause the decline of conductance when intensity improves.
Summary of the invention
The present invention is directed to above-mentioned deficiency, a kind of copper cover aluminum alloy compound wire and production technology thereof of high-strength high-conductivity is provided.
Copper cover aluminum alloy compound wire provided by the invention, the copper of conductive wire cross-section and the area percentage of aluminium alloy are 8%~12%, wherein the percentage by weight of aluminum alloy chemically composition consists of: 0.2%≤magnesium≤0.6%, 0.1%≤silicon≤0.5%, 0.08%≤iron≤0.25%, 0<Zn≤0.1%, 0<copper<0.05%, 0<manganese<0.005%, 0<titanium<0.005%, 0<chromium<0.005%, surplus are aluminium and a small amount of impurity.
The production technology of copper cover aluminum alloy compound wire provided by the invention, step is as follows:
A. the batching of aluminium alloy wire bar;
B. fusing, electromagnetism refining;
C. horizontal casting;
D. pre-tension deformation, control pre-tension deformation reduction of area is 10~30%, gets pre-tension deformation aluminium alloy wire bar base;
E. artificial aging is processed, and the pre-tension deformation aluminium alloy wire bar base that steps d is obtained carries out the artificial aging processing, and 140~200 ℃ of insulations of temperature 0.5~4 hour get the aluminium alloy wire bar;
F. coated copper layer: adopt the clad welded method, with copper strips clad welded outside the aluminium alloy wire bar that step e obtains, making the copper of compound wire bar base cross section and the area percentage of aluminium alloy is 8%~12%, gets copper cover aluminum alloy compound wire bar base;
G. multi-pass stretches;
H. annealing in process gets finished product.
Copper cover aluminum alloy compound wire provided by the invention, use the aluminium alloy that is formed by a small amount of Mg, Si alloying element, adopt horizontal continuous casting process, the solid solubility of crystal grain thinning and raising alloying element, guarantee the complete solid solution of Mg, Si alloying element, adopt the low temperature deformation Technology for Heating Processing of pre-tension deformation and artificial aging processing, effectively control morphosis and the matrix subgrain pattern of alloy strengthening phase, improve tensile property, mechanical property and the electric conductivity of compound wire, and carry out the regulation and control of performance.Mechanical property and the electric conductivity of copper cover aluminum alloy compound wire of the present invention obviously are better than copper cover aluminum and CCAM, by pre-tension deformation and Ageing Treatment its tensile property, mechanical property and electric conductivity are carried out Effective Regulation in the production process, obtain the copper cover aluminum alloy compound wire of high-strength high-conductivity.Production technology of the present invention is simple, saved the copper resource, reduced cable cost.
Embodiment
According to aluminum alloy chemically composition scope of the present invention, adopt aluminium ingot, electrolysis copper ingot and magnesium ingot and silicon, the iron solvent, press in the product each component form calculate reinforced, in smelting furnace, melt, carry out again the electromagnetism refining: the aluminum alloy melt that obtains through the fusing acclivitous chute with electromagnetic field of flowing through, aluminum alloy melt under electromagnetic force along chute to the upper reaches, impurity in the aluminum alloy melt is subject to aluminium alloy reverse extrusion power and Action of Gravity Field to dirty, aluminum alloy melt is separated with impurity, remove impurity, aluminum alloy melt contacts with the oxygen scavenger of chute inwall under the stirring action of electromagnetic field simultaneously, and oxygen is removed a part in the aluminum alloy melt.Adopt the spectrum direct-read method that chemical composition analysis is carried out in the aluminum alloy melt sampling through the electromagnetism refining, its actual measurement composition sees Table 1.Aluminum alloy melt through the electromagnetism refining adopts the horizontal continuous casting equipment with crystallizer to be cast as round line bar base after insulation is filtered, and will justify the round line bar that the line bar is drawn into certain diameter again, and its pre-tension deformation reduction of area sees Table 2.Then should justify the line bar and carry out the artificial aging processing in the 90KW chamber type electric resistance furnace, the temperature and time that artificial aging is processed sees Table 2.Will be after the surface clean of the round line bar that artificial aging is processed, drying, adopting thickness is the copper strips clad welded of 0.36mm, the copper of the compound wire bar base cross section of each embodiment and the area percentage of aluminium alloy see Table 2, then through rough, in draw, carefully draw and be annealed into the copper cover aluminum alloy composite wire of certain specification (0.12 or 0.1mm).The copper-clad aluminum conductor of each embodiment properties of product data and same size and the performance data of aluminium in copper magnesium line see Table 3.
Alloy |
Fe |
Si |
Cu |
Mg |
Mn |
Cr |
Zn |
Ti |
Fine aluminium |
0.112 |
0.086 |
0.005 |
0.003 |
0.004 |
0.003 |
0.068 |
0.002 |
The Al-Mg alloy |
0.132 |
0.098 |
0.162 |
0.964 |
0.005 |
0.002 |
0.059 |
0.003 |
Alloy 1 of the present invention |
0.116 |
0.11 |
0.003 |
0.2 |
0.004 |
0.002 |
0.072 |
0.003 |
Alloy 2 of the present invention |
0.2 |
0.21 |
0.02 |
0.30 |
0.021 |
0.022 |
0.099 |
0.022 |
Alloy 3 of the present invention |
0.21 |
0.36 |
0.035 |
0.45 |
0.031 |
0.030 |
0.031 |
0.030 |
Alloy 4 of the present invention |
0.23 |
0.42 |
0.050 |
0. 50 |
0.049 |
0.048 |
0.001 |
0.048 |
The actual measurement chemical analysis of table 1 aluminium alloy of the present invention and contrast aluminium alloy (percentage by weight, %)
Embodiment |
Al alloy component |
The pre-tension deformation reduction of area |
Artificial aging treatment temperature, time |
The copper of cross section and the area percentage of aluminium alloy |
1 |
See alloy 1 of the present invention |
10% |
140 ℃, 4 hours |
8% |
2 |
See alloy 2 of the present invention |
16% |
160 ℃, 3 hours |
10% |
3 |
See alloy 3 of the present invention |
22% |
180 ℃, 2 hours |
11% |
4 |
See alloy 4 of the present invention |
30% |
200 ℃, 0.5 hour |
12% |
Each embodiment technological parameter of table 2
Product |
Tensile strength/MPa |
Percentage elongation/% |
20 ℃ of resistivity/μ Ω m |
Copper-clad aluminum conductor |
120 |
8.3 |
27.50 |
The aluminium in copper magnesium line |
180 |
10.1 |
31.80 |
Embodiment 1 product |
215 |
13 |
28.33 |
Embodiment 2 products |
218 |
12.2 |
28.16 |
Embodiment 3 products |
221 |
12.1 |
28.02 |
Embodiment 4 products |
223 |
12 |
27.86 |
Table 3 aluminium in copper alloy line of the present invention and contrast product service check result.
As can be seen from Table 3, copper cover aluminum alloy compound wire of the present invention, its mechanical property and electric conductivity obviously are better than existing copper cover aluminum and CCAM.